Oil burner construction



Feb. 18, 1941. G. 1. CARTER OIL BURNER CONSTRUCTION Filed Feb. 25, 19373 Sheets-Sheet l laa FIG..1.

FIG.5

INVENTOR. QEORGE IRW/IG CARTER ATTORNEY.

Feb. 18, 1941. e. l. CART ER OIL BURNER CONSTRUCTION Filed Feb. 25, 19373 Sheets-Sheet 2 INVENTOR. GEQR E IRw/Yq CARTER MA CQMM ATTORNEY.

a. 1. CARTER OIL BURNER CONSTRUCTION Feb. 18, 1941.

3 SheetsSheet 3 Filed Feb. 25, 1937 INVENT OR. 6 6 IRv/r/q CARTER W ,5650M431,

ATTORNEY.

Patented Feb. 18, 1941 v UNITED STATES PATENT OFFICE 2,231,884 on.BURNER CONSTRUCTION George Irving Carter, T mi, N. J.

Application February 25, 19s Serial No. 127,685

22 Claims.

iThis invention relates to oil burner construct on.

Particular reference, for descriptive purposes, will be had in this caseto that type of oil burner construction in which, for the transformationof the oil into a state in which it is combustible efliciently, aspraying device, such asa nozzle, is used. The invention is directed,among other things, to effecting combustion of the fuel as completely aspossible within a very short space, in order that such burner may becapable of utilization in ordinary household furnaces. In many burnersin use, the supply of air has been so proportioned that combustionshould have I proceeded eificiently; yet many factors interfered andprevented efiicient results. Combustion mayactually be completed; yet itwill have been accomplished, if at all, only by introducing a largeexcess of air with consequent extreme loss of heat.

It is an object of,the invention to provide apparatus for burning liquidfuel in which the liquid fuel and the blast air, by the method followedin bringing the blast air to the point where the liquid fuel isatomized, necessarily results in substantially uniform intermixture offuel and air.

Air-streams enter a blast-tube substantially tangentially to theperipheral walls of the tube, the.

air-streams then gyrating in the tube while moving along a substantiallyhelical path up to the position of the device from which the liquid fuelis being sprayed. This centrifugal flow of the air currents has beenfound to incorporate the sprayed fuel quickly into the air-streams,producing substantially uniform mixture of air and fuel so thatcombustion may proceed rapidly.

It is an object of the invention to provide means to control the streamsof air entering the tube without interfering with the tangential mannerof entry of such streams into the tube.

It is an object of the invention to provide apparatus of the typespecified in which the smallest number of elements possible areutilized, wherein the construction may be integrated or resolved intoits elements readily, and especially wherein important elements of theapparatus may be separated as a unit from the apparatus, be replaced bya substitute unit, as, for instance, when repair may become necessary,and the unit for repair be taken to some central point for performanceof such adjustments or the like as may be necessary, whereupon it may bereturned quickly into position, the apparatus all the while beingcapable of functioning without interruption during such period ofrepair, and without disturbing the major body of the apparatus.

It is an object of the invention to provide, for apparatus of the typeherein set forth, a single power source for making all the parts thereofeffective, means made efiective by the single power source producing theseparate and distinct air-streams which then act conjointly within'thetube in producing the centrifugal action.

It is an object of the invention to mount mechanism of this type in suchmanner that vibration is substantially absorbed in such manner as tomake it unnecessary to cushion the apparatus as a whole. A single shaft,driven by the single power source, may provide, at its ends, themountings for a plurality of blower fans, the latter being arranged tocooperate individually with ducts leading up to the blast-tube; Thepower source and the other elements so associated with it are assembledwith a platform carried from the frame of the machine in such mannerthat platform, power source, and these associated elements may vibraterelatively to the body 'of the machine and yet not producenoise or otherundesiriable disturbance orv situation. Yet this entire assemblage, byremoval of but a single coupling, may be separated from the apparatus.

A pair of castings are utilized to define the blower chambers, the blastducts, and the blasttube, and, at the same time, to provide a housing orcover for the operating elements of the machine. The apparatus may beconstructed so that the removal of but one of such castings discloses,for inspection, all the operating elements of the apparatus; after suchdisclosure, by the single disconnection mentioned, the elements may beremoved from the apparatus.

The structure by'which the power source and the blower fans areassociated for removal as a unit may also permit the assembly therewithof means for delivering the liquid fuel under pressure to thefuel-spraying device. In the structure herein specifically disclosed, apump is aflixed to and is carried by theplatform. The apparatus isarranged so that the pump is driven by-the same power source. The pumpis thus removable from the apparatus together withthe power source. Thearrangement is such that the pump is thus also supported so that itsvibrations will be absorbed between platform and frame.

The connection between oil pump and spray nozzle tube is shown herein asmade by a resilient metallic tube. Such tube, in a construction such asto be described herein, may be coiled in such manner that the tubeitself functions as a resilient damping member, functioning to. absorbor dampen vibration between platform and frame.

Other objects of this invention will hereinafter be set forth, or willbe apparent from the description and the drawings, in which areillustrated certain elements considered pertinent for the demonstrationof the invention.

The invention, however, is not intended to be restricted to anyparticular method of operation, construction, or arrangement of parts,

herein shown and described, or to any particular application of any suchapparatus or method, or to any specific manner of use, or to any ofvarious details thereof, herein shown and described, as the same may bemodified in various particulars, or be applied in-many varied relations,without departing from the spirit and scope of the claimed invention,the elements herein illustrated and described being merely types showingsome of various forms the invention might take for practical purposes.

0n the drawings in which the same reference characters refer to the sameparts throughout, and in which are shown the elements mentioned:

Fig. 1 is a plan view of an oil burner embodying features of theinvention;

Fig. 2 is an elevational view of the oil burner shown in Fig. 1:

Fig. 3 is a plan view of the oil burner shown in Fig. 1, to an enlargedscale, the cover being removed to disclose the interior construction ofthe apparatus, the blower fans being broken away in section to clarifythe relationship of parts; the motor and the oil pump, and theconnecting belt, being shown by dot-and-dash lines;

Fig. 4 is a cross-sectional view substantially as seen from the line4--4 of Fig. 1, and substantially to the same scale as Fig. 3; thetransformer, the motor and the oil pump and the belt connecting them,being shown by dot-and-dash lines; and certain parts being shown inelevation to clarify the disclosure; one of the feet of the mounting,shown in elevation, being associated with a'support member shown incross-section, to illustrate that association;

Fig. 5 is a view in cross-section substantially as seen from the line5-5 of Fig. 1, and substan tially to the same scale as Fig. 3,illustrating the arrangement of the control means for the air flow, thevalve controlling the tangential action being shown at fully openedposition;

Fig. 6 is a detail cross-sectional view, to an enlarged scale, on theline H of Fig. 2; and

Fig. 7 is a view of the casing structure, as seen in verticalcross-section from a vertical plane passing through the axis of themotor and fans in Fig. 2, with all parts removed from the apparatus, toillustrate the construction of the casing, the view being one lookingfrom the position of the motor towards the blast tube.

The. oil burner, as shown on the drawings, may consist of a frame F,which, in turn, may include a casing I2 carried upon supports l4..Within frame F may be disposed a motor M, which may be of any desiredconstruction, to drive blower fans l5 and it of the blowers B, and anoil pump P. The fans are disposed in wells 20 and 22,

and discharge into ducts 24 and 28. Associated with the motor is atransformer T for supplying high tension current to electrodes Edisposed within blast-tube 28.

' Casing i2, may be made up of a pair of castings defining a base 30and-a cover 32. Base and cover are intended to cooperate in a mannerhereinafter to be described. The base, which may be a substantiallyY-shaped casting, may be shaped to define the bottom sections 34 and 36of blower wells 20 and 22, from which sections the bottom sections 38and 40 defining ducts 24 and 26 extend forwardly, sections 38 and 40then converging into the bottom section 42 of control chamber 44 whichleads directly into blast-tube 2!, sections 34 and II and 28 and 40cooperating to define the arms of the Y, while section 42 and theblast-tube define the leg of the Y.

A lug 48 may extend downwardly from section 42 to define one of supportsH. In lug 48 a vertical channel 48 may be formed to receive a leg I.fitted to slide vertically within the channel. A slot 82 through the.leg and extending substantially vertically may be provided to receive abolt '4 engaged in lug ll, the head of the bolt, when the bolt istightened, pressing against leg I. at the sides of slot 82 to retain legll fixed in position after adjustment.

Leg 4. is thus substantially centrally disposed below the apparatus as awhole. At the rear portions of the inner faces I and 58 of wells 2. and22, vertically extending ribs ll are formed. Legs 82, with slots 84similar to slot 82 substantially encompassing these ribs, are capable ofsliding vertically relatively to the ribs. Bolts I6, engaged in faces 56and I immediately at the ribs, extend through slots 84, and, in a mannersimilar to bolt 4, look legs 82 in position after the legs have beenslid to a desired position. Legs II and 82 each have footings 68 toprovide a foundation for the machine. Thus, the entire assembly isprovided a three-point support.

Each of the sections 34 and 38 is substantially identical inconstruction. Each has an outer wall II which is unbroken in its extent.Each inner wall 12 is, however, formed with an-opening I4 substantiallyU-shaped in form to permit air to flow to fans II and II. The fans areset in the wells in the usual manner so that walls II of the wells areclosely adjacent'the fans, while end walls 18 are considerably removedfrom the fans, in order to insure efilcient discharge of air from thefans into ducts 24 and 28. as well as the eflicient pick-up of airsupplied to the fans be propelled thereby. Fans I8 and ll, of tiallyidentical capacity, may be of any desired construction; in theparticular case shown, they are of the squirrel-cage type. Shaft llof-motor M extends completely through the motor, and on the extendingends of the shaft the fans are mounted, thus providing a substantiallybalanced assembly.

Motor M may have mounting legs 82 by means of which the motoris securedtoa platform .4 so that the motor is suspended from the platform, themotor carrying with it, of course, shaft Cl and the fans theretosecured. Platform .4 is provided with a number of feet 88. These feetare tapered downwardly, terminating in pins 81, at the junction of whichwith the bodies of the feet are defined shoulders resting. oncomplementary shoulders in wall 94. of section 42 formed at the crotchoi' the Y of casting 30, and extending laterally from the faces and fromwall 94 so as to be located entirely within the space 86 enclosed bywells 20 and 22, the associated ducts, and section 42. Thus, thesebosses and feet I, as will appear .more fully hereinafter, are beyondthe extent of any portion of cover 22 so that 'the cover may easily beslipped into position. The tapered ends of feet I6, extending into thebores of members 88, tend to distend the members so that theyresiliently engage the walls of recesses 9|. A bracket 9| has a footingengaged against the bottom face of platform 84, the bracket providing apair of lugs I08 for engagement against a face I02 of oil pump P,whereby the oil pump may be retained rigidly with relation to theplatform. Any suitable type of oil pump structure may be utilized forthe purposes of this invention. In the particular case shown, the pump,one of small extent, as, for instance, of the gear type, has a shaft I04extending laterally therefrom. On this shaft is a pulley I08 over whichis trained a belt I08 to be engaged over a pulley IIO secured on shaft80.. In this manner, motor M simultaneously drives the oil pump whilethe Y entire assembly is mounted on platform 84 which in turn iscushioned through members 88 to absorb any vibration produced as blowersand oil pump operate.

In. the case shown, an oil-filtering chamber 2 is substantiallyintegrally formed with the oil pump. From chamber II2 leads piping II4,connected in turn to spray tube II8. on wall 84 may be an extendingledge II8 formed with a semi-cylindrical recess I20 in which one end I22of tube II8 may be supported. A clamp piece,

I24 having a complementary recess I26 is positioned over end I22 seatedin recess I20, and is held secured in position by suitable devices I28,

such as cap screws or the like, thus retaining the tube in position.Suitable means such as a coupling I30 serves to connect piping II4 withtube II6. Piping II4 may be vof resilient copper or similar metal, andmay be bent into a loop I32 in such manner that it will form a resilientconnection between the frame and the oil pump. Such a connection wouldfunction to dampen vibrations, with relation to the cas-- ing, 01'elements mounted upon the platform.

Tube II6 extends beyond wall 84 to pass through a spider I34 positionedwithin blast-tube 28, the radiating legs I36 of which are of such lengthas to contact with the walls of the blasttube and thus provide a supportfor tube H8 and electrodes E which also are carried in the spider. Thespider may be secured on tube II6, as, for instanceQby a set-screw, toretain the assembly in position. Suitable passages I38 are formed in thelegs of the spider for insertion of the electrodes, the legs being slitup to the passages, and any suitable compressing meansbeing utilized, inorder to clamp the electrodes in posidownwardly through a cut-awaysection I48 .of

the platform, and then through insulating nipples I50 mounted in wall 84to be coupled to the electrodes. The nipples are seated in notehe I52formed in the wall.

be retained in sition on the- Cover 32 may p0 I86. a section base bysuitable securing devices I54, such as cap screws, extended throughopenings I58 at bosses I58 provided for that purpose in the cover, toengage within tapped openings I60 in similar bosses I62 in the base.Cover 32 can be considered to'be divided into three distinct portions.Looking at the cover as if it were inverted, it will be found that thereis a large well I64 which coincides with space 88 and within which theupward extension of the platform and the transformer is housed. As amatter of fact, when the 1 tions 34 and 30' in defining blower wells 20and 22, and top sections I10 and "Ho cooperate with sections 38 and 48in defining ducts 24 and 26. For the production of these differentsections, wall I14, which defines well I64, seats immediately over thetop edges of walls 12 and over wall 84 when the cover is in position.Wall I14 does not, however, interfere with bosses 82 nor with thecooperation with said bossw of feet 86 as the wall is no thicker thanthe normal thickness of walls 12. ,Notches I52 are closed by a sectionI16 of wall I14 complementary to the formation of the electrodes;section I16 also has a cut-out I18 likewise complementary to tion I84terminates in a bell I88. The bell rests upon the inner edge of theblast-tube, thus producing a substantially sealed tube.

Ducts 24 and 26, defined by sections 38 and 40, and the complementarysections I10 and I12 of cover 32, are substantially parallel to eachother, and are substantially at the same level. However, in the deliveryducts I88 and I80 providing communication between ducts 24 and 28' andcontrol chamber 44, a different construction is involved. I Duct I88 isdirected upwardly to meet control chamber 44 tangentially at itsuppermost portion, while duct I80, on the other hand, is directeddownwardly to meet control chamber 44 tangentially at its lowermostportion so that its air-streamwill enter the chamber substantially atits lowermost portion, and di ametrically' opposite the position ofentry of the stream from duct I88. Considering a section of theapparatus such as shown in Fig. 5, which is transversely across thechamber and the associated apparatus at this intersection, theconstruction will be found to define a pair of ports I82 and I84 openingbetween the respective ducts I88 and I80'and the chamber. The incline ofthe respective ducts to' the respective ports is such that therespective air-streams en 1'' blast-tube substantially tangentially. Botl'fduh t; are directed forwardly at a slight angle so that, despite thefact that. the streams enter the chamber going substantially in oppositedirectrons, yet, by reason of the fact that the points of entry are atsubstantially oppositely disposed diametrical positions, and by reasonof the slight forward inclination of the ducts, a helicalflow of bothair-streams within the blast-tube will result.

In chamber 44 is disposed a cylindrical shell of which is completelybroken away to provide an. opening I88, while, at the oppositelydisposed portion of the shell, another opening 200 of the same characteris formed, except that a rib 202 connects the two plates 204 and 206 ofthe shell thus defined, so that the plates may rotate together andsimultaneously. Plates 2 04 and 206, in their movement, control theopening of ports I82 and I94, and thus provide means for controlling theflow of air from the blower fans into the blast tube. However,. it

will be noted that the opening edges 2" of the plates move towards andaway from the extreme top wall and extreme bottom walls of ducts I88 andI90, respectively, so that the air-flow to chamber 44 will, at alltimes, be restricted to the outermost portions of the ducts and chamher, so that the tangential action of these airstreams will not beaffected, the only eflect being in more finely defining the extent ofthese air-streams as they enter the chamber, and the blast-tube whichlies immediately adjacent. A

bolt 2M may be engaged with rib 202, and be extended through a slot ii!in wall 2 of the chamber, thus providing means for manipulating thevalve defined by shell I96 from a position externally of the blast-tube.By tightening the bolt into engagement with wall 2, it provides meansfor fixing the valve in position, once it has been adjusted.

In the substantially parallel sections of ducts 24 and 26, dampers 2l8may be provided. These dampers may be in the form of circular platesIll, held substantially in the same plane, but at opposite ends of asingle rod 220 so thatthey are simultaneously movable and to the samedegree. This rod may be located in notches 222 in walls 12 whichcooperate with similar notches in wall I I4, so that the rod is lockedin position by the assembly of the cover with the base. These dampersmay be used to control the quantity of air flowing to ports I92 and I94without varying the fineness of the stream entering the chamber.

A crank arm 228 may be affixed to rod 220 and be pivotally connected toa link 2". The link may have a slot 232 in the body thereof throughwhich may extend a bolt 2 to engage in one oi faces 56 or 58 to be usedas means for locking the dampers in an adjusted position.

The air-streams, entering the blast-tube, by

the position of their entry, will swirl through the blast-tube. Theslight forward propulsion of the streams entering chamber 44, inaddition to the pressures attained, serve to cause the streams to moveforwardly towards the nozzle.

Since, from this swirling action, to a degree at least, the moving gaseswill tend to move out close to the outer walls of the fire-tube, amouthpiece ring 238 may be assembled at the extreme end of the blasttube in order more positively to converge the gases once they havepicked upthe liquid fuel. This mouthpiece may have a converging innerwall 23. coming up to an outlet opening 2 smaller than the bore of theblasttube. The continuously swirling gases will thus be brought moreclosely into intermixing relationship with the fuel as they pass beyondthat point because of this close relationship between gases and fuel tobe consumed. The ring may be held in position by means of set-screws 2,extended through 'the walls of the blast-tube adjacent the end, andengaged in a groove 2 in a flange 246 of the ring. 2

After screws I54 have been removed, the cover may be separated from thebase at will merely by disconnecting coupling I 30, and thusreleasingthe connectionbetween the oil pump and tube 6, the platform togetherwith its assembled elements may be liftedout of position. Of course,

rod 220 may be disconnected from the apparatus by releasing its bolt 234to permit this separation. Once the separation has been effected, asimilar and identical unit may be placed in position, and by thesesimple connections, made to function in place of the other unit, whichmay then be removed to a central factory for such repairs as may befound necessary.

Many other changes could be eifected in the particular elementsdesigned, and in the methods of operation and use, and in the apparatusherein set forth, and in specific details thereof, without substantiallydeparting from the invention intended to be defined in the claims, thedescription being merely of elements illustrating certain phases of thespirit oi the invention.

What is claimed as new and useful is:- 1. Inoil burner construction, aplurality of airblast ducts, a single blast-tube, the blast-tube at oneend thereof having a plurality of ports opening'therethrough, each ofthe ducts discharging into the blast-tube through one of the ports, the

direction of the air-blasts from the several ducts entering theblast-tube through the several ports producing a single cyclonicair-flow the blasttube, and means for simultaneously controlling theeffective opening of all the ports.

-2. In oil burner construction, a plurality of airblast ducts, a singleblast-tube, the blast-tube at one end thereof having a plurality ofports opening therethrough, each of the ducts discharging into theblast-tube through one of the ports, the direction of the air-blastsfrom the several ducts entering the blast-tube through the several portsproducing a single cyclonic air-flow through the blast-tube, and meansmounted for rotation in the blast-tube to control simultaneously theeffective opening of all the ports.

3. Incl] burner construction, a pair of airblast ducts extending insubstantially the same general direction, a single blast-tube betweenand extending in substantially the samegeneral di-.

rection as the ducts, an oil-diffusing device within the blast-tube anddisposed substantially axiaily thereof, the blast-tube at one endthereofhaving substantially diametrically opposed ports openingtherethrough, each of the ductsbeing provided with an end to connect theduct to a port, means for simultaneously impelling air through the ductssubstantially in the same general direction, the end of each duct beingdirected obliquely forward in the same general direction as its duct,the direction of the air-blasts from the ducts entering the blast-tubethrough the several ports being effective to cause the air within theblast-tube to move up to the oil-diffusing device blast ducts, a singleblast-tube, the blast-tube at one end thereof having a plurality ofports opening therethrough, each of the ducts discharging into theblast-tube through one of the ports, means for simultaneously impellingair through the ducts substantially in the same general direction, thedirection of the air-blasts from the several ducts entering theblast-tube through the several ports producing a single cyclonic air.-fiow through the blast-tubejmeans' for controlling the efl'ectiveopening of the ports, and means for simultaneously controlling the fiowof air through all the ducts independently of the port controllingmeans.

5. In oil burner construction, a pair of air-blast ducts extending insubstantially the same general direction, a single blast-tube betweenand extendmg in substantially the same general direction each of theducts discharginginto the blast-tube through one of the ports, means forsimultaneously impelling air through the ducts substantially in the samegeneral direction, the direction of the air-blasts from the ductsentering the blast-tube through the several ports producing a singlecyclonic air-flow through the blast-tube, means for controlling theefiective opening of the ports, a rod extending transversely'of and intoboth ducts, a plate on the rod in each of the ducts for simultaneouslycontrolling the flow of air through the ducts, and means for rotatingthe rod.

'6. In oil burner construction, a Y-shaped frame, the leg of the Y beingdefined bya blasttube, the arms of the Y being defined by a pair ofblower casings and blast ducts leading away from the blower casings tothe blast-tube; a carrier resiliently supported'upon and between theducts; a motor suspended from the carrier, the shaft of the motorextending in opposite directions from the motor and into both casings;and a blower on the shaft in each of the casings.

7. In oil burner construction, a frame including a blast-tube, a pair oflegs extending substantially parallelly away from 'the blast-tube andspaced from each other to provide an opening behind the blast-tube, thelegs being substantially open sections, each leg being provided with incommunicating open section to provide a connection to the blast-tube,and a single cover for the frame and for the opening to form blast ductswith the open sections.

8. In oil burner construction, a frame including a blast-tube, a pair oflegs extending substantially parallelly away from the blast-tube andspaced from each other to provide an opening behind the blast-#tube, thelegs being substantially open sections, each leg being provided at oneend with a communicating open'section to provide a connection to theblast tube, blower wells at the other ends of the leg open sections, asingle cover for the frame and for the opening to form blast ducts withthe open'sections and blower casings with-the blower wells, ashaftextending into both casings, a blower on the shaft in each of thecasings, a motor carried in the opening for driving the shaft, andsupport means for the frame, the support means comprising three members,two of the members being positioned individually in association with thecasings, and one of the members being positioned beneath the blast-tube,each'of the members being individually'adjustable to regulate its ownheight.

9. In oil burner construction, a frame including a blast-tube, ,a pairof legs extending substantially parallelly away from the blast-tube andspaced from each other to provide an opening behind the blast-tube, thelegs being substantially open sections, each leg-being provided at one,end with a communicating open section to provide a connection to theblast-tube, blower wells at the other ends of the leg open sections, asingle cover for the frame andfor the opening to form blast ducts withthe open sections andblower casings with the blower wells, acarrierresiliently supported upon the frame and in the opening betweenthe legs, a motor supported by the carrier, the shaft. of the motorextending in opposite directions from the motor and into both casings, ablower on the shaft in each of the cas-' ings, and support means for theframe, the support means comprising three members, two of the membersbeing positioned individually in association with the MEL, and one ofthe members being positioned beneath the blast-tube. each ,of themembers being individually adjustable to regulate its own height. a

10. In oil burner construction, a frame including a blast-tube, and apair of legs extending substantially parallelly away from the blast-tubeand spaced from each other to provide an opening behind the blast-tube;the legs being substantially open sections,\the legs having a commonjunction point at one end with the blasttube, blower walls at the otherends of the leg open sections; a single cover for the frame, for thejunction point, and for the opening to form blast duets with the opensections and blower casings with the blower wells; the blast-tube atdiametrically opposed portions thereof at the junction point havingportsto provide individual communication for each blast duct with theblast-tube; a single valve at the junction point for determining thedegree of opening of the ports; an oil-,diflusing device in theblast-tube; electrodes in the blast-tube; a carrier resilientlysupported upon and in the opening, a transform er for the electrodesmounted on the carrier; a motor and an oil-pump suspended from thecarrier, the shaft of the motor extending in opposite directions fromthe motor and into both casings; means on the shaft for driving theoil-pump; a blower on' the shaft in each of the casings; and supportmeans for'the frame, the support means comprising three members, two ofthe members being positioned individually in association with thecasings, and one of the members being positioned beneath the blast-tube,each of the members being individually adjustable to regulate its ownheight.

11. In oil burner construction, a plurality of air-blast ducts, a singleblast-tube having a pluralityof ports opening through the walls of theblast-tube at one end thereof, each duct. being connected to theblast-tube through one of the ports and bei g positioned to direct itsblast through the port tangentially of the blast-tube, the direction ofthe airblasts from the several ducts entering the blast-tube through theseveral ports producing a single cyclonic air flow through theblast-tube, andmeans for controlling the effective opening of the portswhile maintaining the tangential direction of the blasts. x

12. In oil burner construction, a plurality of air-blast ducts, a singleblast-tube having a plurality of ports opening through the walls of theblast-tube at one end thereof, each duct being connected to theblast-tube through one of the ports and being positioned to direct itsblast through the port tangentiallyof theblast-tube, the direction ofthe air-blasts from the several ducts entering the blast-tube throughthe several ports producing a single cyclonic air flow through theblast-tube, and a single valve for simultaneously controlling theeflective opening of all the ports while maintaining the tangentialdirection of the blasts. I

13. In oil burner construction, a plurality of air-blast ducts, a singleblast-tube having a plurality of ports opening through the walls of theblast-tube at one end thereof, each duct being connected to theblast-tube through one of the ports and being positioned to direct itsblast through the port tangentially of the blast-tube, the direction ofthe air-blasts from the several ducts entering the blast-tube throughthe several ports producing a single cyclonic air flow through theblast-tube, and a sleeve mounted for iii the blasts while maintainingthe tangential direction of the blasts.

14. In oil burner construction, a pair of airblast ducts extending insubstantially the same general direction, a single blast-tube betweenand extending in substantially that same general direction, anoil-diffusing device within the blasttube and disposed substantiallyaxially thereof, the walls of the blast-tube at substantiallydiametrically opposed positions at one end thereof having ports openingtherethrough, each duct being Provided with an end to connectthe duct tothe port, means for impelling air simultaneously and substantially atthe same rate through the ducts substantially in that same generaldirection, the duct end being directed obliquely forward in that samegeneral direction so that airblasts from the ducts entering theblast-tube through the several ports cause the air within the blast-tubeto move upto the oil-diffusing device as a single cyclonic air-flowmoving in substantially that same general direction through theblast-tube, and means for controlling the eifective air delivery throughthe ports. I

15. In oil burner construction, a Y-shaped frame, the leg of the Y beingdefined by a blasttube; the arms of the Y being defined by a pair ofblower casings and blast ducts leading away from the blower casings tothe blast-tube, the ducts and the casings being positioned in spacedapart rela nship; the walls of the casings being substantially unbrokenexcept for air inlets in directly opposed walls of the casings openinginto the space between the casings; a motor mounted within the spacebetween the casings, the shaft of the motor extending out of the spacein opposite directions from the motor and into both c'asings through theair inlets, and a blower on the shaft in each of the casings.

16. In oil burner construction, a frame including a blast-tube, a pairof legs extending substantially parallelly away from the blast-tube andspaced from each other to provide an opening behind the blast-tube, eachleg being substantially an open section of a tube, each leg beingprovided at one end with an open section connecting the leg to theblast-tube, blower wells at the other ends of the leg open sections,opposed walls of the wells having air inlets opening therethrough, and asingle cover extending over both legs and the wells to form blast ductswith the open sections of the tubes, and to form with the blower wellsblower casings having air inlets opening into the space between theblower wells.

17. In oil burner construction, a plurality of air-blast ducts, a singleblast-tube, and communicating means between the ducts and the blast-tubefor directing the several blasts from the ducts angularly forwardly awayfrom the point of entry and also tangentially of the blasttube at thepoint of entry into the blast-tube to unite within the blast-tube toproduce a single air flow moving through the blast-tube away from theentry end but gyrating cyclonically about the axis of the blast-tube.

' 18. In oil burner construction, a plurality of air-blast ducts, asingle blast-tube, and communicating means between the ducts and thetube; the arms of the Y being defined by a pair of blower casings andblast ducts leading'away from the blower casings to the blast-tube, theducts being positioned in spaced apart relationship; a carrier in thespace between the ducts and removably supportedupon the ducts, a motorsupported by the carrier and within the space, the shaft of the motorextending out of the space in opposite directions from the motor andinto both casings, and a blower on the shaft in each of the casings.

20. In oil burner construction, a plurality of substantially parallelair-blast ducts, a single blast-tube, individual means cooperating witheach duct for impelling air simultaneously and substantially in the samegeneral direction through the several ducts, and means for guiding theair-blasts from the several ducts into the blast-tube substantiallytangentially of the blasttube and in a direction having a substantialdirectional component of said general direction,-the guiding means beingpositioned relatively to the blast-tube so that the air-blasts unite inthe blast-tube into a single cyclonic air-flow moving through theblast-tube in substantially that same general direction.

21. In oil burner construction, a plurality of substantially parallelair-blast ducts, a single blast-tube between and substantially parallelto the ducts, the blast-tube having a plurality of ports openingtherethrough adjacent one end thereof, individual means in each duct forilnpelling air substantially in the same general directionsimultaneously-through the several ducts,

and each of the ducts being provided with an end bent angularlyforwardly and connected to a port to direct its air-blast from its ductsubstantially tangentially into the blast-tube through the port with asubstantial directional component of said general direction but as anelement of a single cyclonic air-flow moving in substantially that samegeneral direction through the blast-tube.

22. In oil burner construction, a plurality of air-blast ducts, a singleblast-tube, a blower for GEO. '1. mm.

